In this lab, you will add a specialised bank account class (Fixed Term Savings Account) to an application that already has other kinds of bank account classes defined. The lab will get you to extend the class hierarchy to include a fixed term savings account. This kind of account is like a savings account, except it has a maturity date and money cannot be removed from the account until the maturity date is reached. It also has an opening date and money can only be deposited into the account during the first 7 days of the account being opened (the ‘deposit window’), after that, the balance is frozen until the interest is added at the end of the term.